Lattice gantry crane (HO scale)

Model Overview & Print Notes

This is a model of a gantry crane for HO- scale (1/87) model railroad and similarly-scaled dioramas. The model is based on a real KK-12.5-32 crane, though it's considerably scaled down to fit home layouts. The model spans 3 tracks and adheres to NEM-102 rules for height and side clearance. After designing the model, it came to my attention that it might be unrealistically low for a gantry crane. If you deem it so, you can scale the whole thing up by some 20%, or only scale "Leg bottom (1)" along its longest axis. Crane wheels, carriage and winch reels are made to move and spin freely, however it's only useful if you motorize the thing, which I have not yet managed to. So at the moment they can be simply glued in place. To make wheels spin, use a piece of metal paperclip or similar metal wire as an axle. If your printer makes holes smaller, a hand drill might be needed to make axles fit. The model contains a lot of ladders and railings. In reality, they are thinner, so if you have experience with copper/brass wires and strips, the railings are better created with wires/strips. 3D printed ones still look fine though. Instructions are in this youtube video: https://youtu.be/Ab9z1KcUGJA Files to print (all files are in ZIP file): **Center beam** - Bottom frame.stl - Center frame.stl - Side frame 1.stl - Side frame 2.stl - Railings.stl - Steps.stl - Pulley.stl **Legs** - Wheel block.stl x2 - Wheel.stl x4 - Leg top (1).stl x4 - Leg bottom (1).stl x4 - Leg top joint.stl x2 **Carriage** - Carriage half.stl x2 - Cariage wheel.stl x3 - Hook.stl x1 (That might be tricky to print. PM me if you have issues) **Cabin and ladders** - Cabin floor.stl - Cabin base.stl - Cabin windows.stl - Cabin railings.stl - Cabin railings 2.stl - Ladder at bottom.stl - Ladder to top.stl **Maintenance platform** - Maint. platform.stl - Maint. platform ladder.stl - Maint. platform railing.stl x2 **Accessories** - Electric cabinet.stl - Winch case.stl - Winch reel.stl ## 3D Printing Settings You need a really well-sticking bed for large but thin objects to print well. The model is designed to fit into 220x220 mm Ender 3 bed (place long parts diagonally). The model was sliced with 0.12mm layer height, default 0.4mm nozzle of a Creality Ender-3. Most of the files don't require supports. "Carriage half.stl" might require supports, but I've printed without, it's a small part and drooping doesn't show much. Plastic is an ordinary PLA.

Files (2)